diff --git a/loader/setup_FS.c b/loader/setup_FS.c deleted file mode 100644 index 6d5cc892dd..0000000000 --- a/loader/setup_FS.c +++ /dev/null @@ -1,215 +0,0 @@ -#include -#include -#include -#include -#include -#include -#include -#include - -#ifdef __linux__ -#include -#include -#else /* !__linux__ */ - -#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) -#include -#endif - -#ifdef __svr4__ -#include -#include -/* solaris x86: add missing prototype for sysi86() */ -extern int sysi86(int, void*); -#ifndef NUMSYSLDTS /* SunOS 2.5.1 does not define NUMSYSLDTS */ -#define NUMSYSLDTS 6 /* Let's hope the SunOS 5.8 value is OK */ -#endif -#define TEB_SEL_IDX NUMSYSLDTS -#endif /* __svr4__ */ - - - -#define LDT_ENTRIES 8192 -#define LDT_ENTRY_SIZE 8 -#pragma pack(4) -struct modify_ldt_ldt_s { - unsigned int entry_number; - unsigned long base_addr; - unsigned int limit; - unsigned int seg_32bit:1; - unsigned int contents:2; - unsigned int read_exec_only:1; - unsigned int limit_in_pages:1; - unsigned int seg_not_present:1; - unsigned int useable:1; -}; - -#define MODIFY_LDT_CONTENTS_DATA 0 -#define MODIFY_LDT_CONTENTS_STACK 1 -#define MODIFY_LDT_CONTENTS_CODE 2 -#endif /* !__linux__ */ - -#include "setup_FS.h" - - - -/* user level (privilege level: 3) ldt (1<<2) segment selector */ -#define LDT_SEL(idx) ((idx) << 3 | 1 << 2 | 3) - -#ifndef TEB_SEL_IDX -#define TEB_SEL_IDX 1 -#endif - -#define TEB_SEL LDT_SEL(TEB_SEL_IDX) - -void setup_FS_Segment() -{ -#ifdef DETAILED_OUT - printf("Setup FS...");fflush(stdout); -#endif - __asm__ __volatile__( - "movl %0,%%eax; movw %%ax, %%fs" : : "i" (TEB_SEL) - ); -#ifdef DETAILED_OUT - printf("OK!\n"); -#endif -} - - -/** - * - * This should be performed before we create first thread. See remarks - * for write_ldt(), linux/kernel/ldt.c. - * - */ - -static void* fs_seg=NULL; - -#ifdef __linux__ - /* XXX: why is this routine from libc redefined here? */ - /* NOTE: the redefined version ignores the count param, count is hardcoded as 16 */ - static int modify_ldt( int func, struct modify_ldt_ldt_s *ptr, - unsigned long count ) - { - int res; -#ifdef __PIC__ - __asm__ __volatile__( "pushl %%ebx\n\t" - "movl %2,%%ebx\n\t" - "int $0x80\n\t" - "popl %%ebx" - : "=a" (res) - : "0" (__NR_modify_ldt), - "r" (func), - "c" (ptr), - "d"(16)//sizeof(*ptr) from kernel point of view - :"esi" ); -#else - __asm__ __volatile__("int $0x80" - : "=a" (res) - : "0" (__NR_modify_ldt), - "b" (func), - "c" (ptr), - "d"(16) - :"esi"); -#endif /* __PIC__ */ - if (res >= 0) return res; - errno = -res; - return -1; - } -#endif - -#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) - static void LDT_EntryToBytes( unsigned long *buffer, const struct modify_ldt_ldt_s *content ) - { - *buffer++ = ((content->base_addr & 0x0000ffff) << 16) | - (content->limit & 0x0ffff); - *buffer = (content->base_addr & 0xff000000) | - ((content->base_addr & 0x00ff0000)>>16) | - (content->limit & 0xf0000) | - (content->contents << 10) | - ((content->read_exec_only == 0) << 9) | - ((content->seg_32bit != 0) << 22) | - ((content->limit_in_pages != 0) << 23) | - 0xf000; - } -#endif - -void Setup_LDT_Keeper(){ - struct modify_ldt_ldt_s array; - int fd; - int ret; - void* prev_struct; - - if(fs_seg) return; // already set! - - fd=open("/dev/zero", O_RDWR); - fs_seg=mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, - fd, 0); - if(fs_seg==(void*)-1) - { - perror("ERROR: Couldn't allocate memory for fs segment"); - return; - } - array.base_addr=(int)fs_seg; - array.entry_number=TEB_SEL_IDX; - array.limit=array.base_addr+getpagesize()-1; - array.seg_32bit=1; - array.read_exec_only=0; - array.seg_not_present=0; - array.contents=MODIFY_LDT_CONTENTS_DATA; - array.limit_in_pages=0; -#ifdef __linux__ - ret=modify_ldt(0x1, &array, sizeof(struct modify_ldt_ldt_s)); - if(ret<0) - { - perror("install_fs"); - printf("Couldn't install fs segment, expect segfault\n"); - } -#endif /*linux*/ - -#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) - { - unsigned long d[2]; - - LDT_EntryToBytes( d, &array ); - ret = i386_set_ldt(array.entry_number, (union descriptor *)d, 1); - if (ret < 0) - { - perror("install_fs"); - printf("Couldn't install fs segment, expect segfault\n"); - printf("Did you reconfigure the kernel with \"options USER_LDT\"?\n"); - } - printf("Set_LDT\n"); - } -#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */ - -#if defined(__svr4__) - { - struct ssd ssd; - ssd.sel = TEB_SEL; - ssd.bo = array.base_addr; - ssd.ls = array.limit - array.base_addr; - ssd.acc1 = ((array.read_exec_only == 0) << 1) | - (array.contents << 2) | - 0xf0; /* P(resent) | DPL3 | S */ - ssd.acc2 = 0x4; /* byte limit, 32-bit segment */ - if (sysi86(SI86DSCR, &ssd) < 0) { - perror("sysi86(SI86DSCR)"); - printf("Couldn't install fs segment, expect segfault\n"); - } - } -#endif - - setup_FS_Segment(); - - prev_struct=malloc(8); - *(void**)array.base_addr=prev_struct; - close(fd); -} - -void Restore_LDT_Keeper() -{ - if(fs_seg==0) return; - munmap((char*)fs_seg, getpagesize()); -} - diff --git a/loader/setup_FS.h b/loader/setup_FS.h deleted file mode 100644 index 616af1d210..0000000000 --- a/loader/setup_FS.h +++ /dev/null @@ -1,10 +0,0 @@ - -#ifndef setup_FS_h -#define setup_FS_h - -extern void setup_FS_Segment(void); -extern void Setup_LDT_Keeper(void); -extern void Restore_LDT_Keeper(void); - - -#endif